51417939457 has 4 divisors (see below), whose sum is σ = 51418631236. Its totient is φ = 51417247680.

The previous prime is 51417939437. The next prime is 51417939467. The reversal of 51417939457 is 75493971415.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 39856528881 + 11561410576 = 199641^2 + 107524^2 .

It is a cyclic number.

It is not a de Polignac number, because 51417939457 - 2³¹ = 49270455809 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 51417939398 and 51417939407.

It is not an unprimeable number, because it can be changed into a prime (51417939437) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 218844 + ... + 388237.

It is an arithmetic number, because the mean of its divisors is an integer number (12854657809).

Almost surely, 2^51417939457 is an apocalyptic number.

It is an amenable number.

51417939457 is a deficient number, since it is larger than the sum of its proper divisors (691779).

51417939457 is an equidigital number, since it uses as much as digits as its factorization.

51417939457 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 691778.

The product of its digits is 4762800, while the sum is 55.

The spelling of 51417939457 in words is "fifty-one billion, four hundred seventeen million, nine hundred thirty-nine thousand, four hundred fifty-seven".